Initial commit

Initial commit from f5090258 of the internal arnold_usd repo.

Co-Authored-By: Pal Mezei <sirpalee@users.noreply.github.com>
Co-Authored-By: Sebastien Blaineau-Ortega <sebastienblor@users.noreply.github.com>

.clang-format

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+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
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+

.gitignore

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+*/build
+*/install
+*/download
+.externalToolBuilders
+
+# Python
+*.py[cod]
+
+# C++
+*.so
+*.a
+*.lai
+*.la
+*.dylib
+*.dll
+*.o
+*.os
+*.slo
+*.lo
+
+# Compilation database
+compile_commands.json
+
+# SCons
+.sconsign.dblite
+custom*.py
+dist
+build
+install
+
+# Eclipse
+.settings
+.*project
+
+# JetBrains
+.idea
+cmake-build-*
+
+# Visual Studio Code
+.vscode
+
+# Generated plugInfo.json files
+**/plugInfo.json
+
+# backup and temp
+*.swp
+*.bak
+*~
+
+# mac cruft
+.DS_Store

CONTRIBUTING.md

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+Contributing to Arnold USD
+=======================
+
+# Do’s and Don’ts
+
+* **Search tickets before you file a new one.** Add to tickets if you have new information about the issue.
+* **Keep tickets short but sweet.** Make sure you include all the context needed to solve the issue. Don't overdo it. Great tickets allow us to focus on solving problems instead of discussing them.
+* **Take care of your ticket.** When you spend time to report a ticket with care we'll enjoy fixing it for you.
+* **Use [GitHub-flavored Markdown](https://help.github.com/articles/markdown-basics/).** Especially put code blocks and console outputs in backticks (```` ``` ````). That increases the readability.
+* **Do not litter.** Don’t add +1’s _unless_ specifically asked for and don’t discuss offtopic issues.
+
+## Bug Reports
+
+In short, since you are most likely a developer, provide a ticket that you
+_yourself_ would _like_ to receive.
+
+We depend on _you_ (the community) to contribute in making the project better
+for everyone. So debug and reduce your own issues before creating a ticket and
+let us know of all the things you tried and their outcome. This applies double
+if you cannot share a reproduction with us because of internal company policies.
+
+Please include steps to reproduce and _all_ other relevant information,
+including any other relevant dependency and version information.
+
+## Feature Requests
+
+Please try to be precise about the proposed outcome of the feature and how it
+would related to existing features.
+
+## Pull Requests
+
+We **love** pull requests!
+
+All contributions _will_ be licensed under the Apache 2.0 license.
+
+Code/comments should adhere to the following rules:
+
+* All changes require test coverage (where it's applicable) to ensure it does
+  not break during refactor work, as well as ensure consistent behavior across
+  supported platforms.
+* Comments are required for public APIs. See Documentation Conventions below.
+* When documenting APIs and/or source code, don't make assumptions or make
+  implications about race, gender, religion, political orientation, or anything
+  else that isn't relevant to the project.
+* Remember that source code usually gets written once and read often: ensure
+  the reader doesn't have to make guesses. Make sure that the purpose and inner
+  logic are either obvious to a reasonably skilled professional, or add a
+  comment that explains it.
+* Pull requests will be squashed and merged. Please add a detailed description;
+  it will be used in the commit message and paraphrased in release notes.
+
+## More Details
+
+For coding and documentation conventions check out these sub-pages:
+
+[Code Conventions](docs/conventions.md)
+
+[Documentation Conventions](docs/documenting.md)